> >* Memory is free, speed is what is worth optimizing.> True within strict limits.

What strict limits? What is the basis for the assertion that
memory is free, and what is its application? Granted, there are
some optimizations in use today that improve performance by using
more memory, but there are many more optimizations that are
rejected without serious consideration because the memory costs
are prohibitive. If memory is free, why bother calculating
double-precision trig functions when a table lookup is faster?